The M 20/21/22 are the same lenght as a saginaw trans. The M 22 should be a 1 1/8x26 spline input shaft, with a 30 spline output shaft(same as a 400 turbo). i wont say all, but most of the passenger M 20/21s had a 1 1/8x 10 spline input, & same out put spline as a saginaw, or a 350 turbo(27 spline i beleive). 67 & earlier truck bell has the proper centerhole for the Muncie trans(4.683,same as the car). The 68 up truck bells have a 5.126 center hole......if you run into this, you can swap the bell, or have a ring machined to press over the front bearing retainer on the muncie to give the proper pilot. The bottom 2 bolts on the trans will be a bolt & nut deal, as the truck bell is not threaded(no problem tho). Good luck,crazyL 
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
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